Weather in Big Bend is unpredictable. I can reach almost one hundred degrees in February; it can snow in April. It is a desert, and one does not expect much rain, but if it rains during your visit and you are not prepared, you get wet. Check out the Visit Big Bend weather resources.
Big Bend is further south and west than most of Texas, and the region is often affected by weather originating in the Pacific Ocean, in contrast to the influence that the Gulf of Mexico has on much of the state. Weather conditions can be distinctly different than other parts of the state. To make things even more confusing, television weathermen stand in front of far west Texas as they point to the more populated parts of the state and country.